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ULTRASTRUCTURE OF NICOTIANA ALATA POLLEN, ITS GERMINATION AND EARLY TUBE FORMATION
Author(s) -
Cresti M.,
Ciampolini F.,
Mulcahy D. L. M.,
Mulcahy G.
Publication year - 1985
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1985.tb08331.x
Subject(s) - pollen , biology , pollen tube , ultrastructure , germination , botany , endoplasmic reticulum , nicotiana , cytoplasm , solanaceae , microbiology and biotechnology , pollination , biochemistry , gene
Both internal anatomy and external morphology of the mature pollen grain of Nicotiana alata have been studied, together with pollen activation and tube emergence and its cytological zonation. A peculiar feature of mature pollen is the occurrence in the vegetative cell cytoplasm of a large quantity of stacked cisterns of rough endoplasmic reticulum, which then dissociate during pollen activation. Pollen tube emergence generally occurs 2 hr 30 min after hydration, while cytological zonation is complete 4 hr 30 min after hydration when the first callosic plug is formed.